Pot type burner with admission of air at two levels



POT TYPE BURNER WITH ADMfSSIlON OF AIR AT TWO LEVELS Filed Nov. 14, 19413 a, M m 1 0 N 2 6 W M r 7 It 16 m i wfl 1 w 1:: J IQ... 1.6 6 0 n m j55 2// Y/ 8 2 7 o q W7 w 1 o 3 m\ o 7 1% M W/ M/m 1L m 1 9 o H H wh w 46 V Patented Nov. 7, 1944.

PO'I. TYPE BURNER WITH ADMISSION OF AIR AT TWO LEVELS Bruce Hayter,Santa Fe, N. Men, assignor to Oil Devices, Santa Fe, N. Men, a limitedpartnership of Illinois Application November 14, 1941, Serial No.419,103

' 2 Claims. (Cl. 158-91) This invention relates to an improvement inliquid hydrocarbon burners and has for a particular purpose theprovision of an improved pot type burner having a maximum turndown.

Another purpose is the provision of such a burner in which a baflle orpilot ring is employedin order to permit a minimum turndown when minimumheat or no heat is desired.

Another purpose is the provision of a simplified pot type burner inwhich the air is admitted to the pot at a minimum of separate levels.

Another purpose is the provision of a pot type burner in which thecombustion at all stages is substantially free from smoke or carbondeposit.

Other purposes will appear from time to time in the course of thespecification.

The invention is illustrated more or less diagrammatically in theaccompanying drawing wherein:

Fig. l is a vertical axial section; and

Fig. 2 is a section on the line 2-4 of Fig. 1.

Like parts are indicated by like symbols throughout the specificationand drawing.

Referring to the drawing, I generally indicates an outside housing,herein shown as in the form of'a drum or cylinder supported on anysuitable means, such as the supporting ringor base 2, with feet orsupports 3 adapted to elevate the drum. I above the floor or supportingsurface so that air may penetrate therebeneath. 4 is any suitable bottommember having a central aperture 5 for the admission of air to the spacewithin the lower portion of the drum I.

6 is a burner pot, having aslightly concave bottom I and a liquid fuelinlet pipe 8 from any suitable source of liquid fuel not herein shown.It will be understood that any suitable valve means not herein shown,which may be automatic or manual, may be employed for varying the supplyor volume of flow of the liquid fuel to the pot.

The pot is provided with an upwardly and outwardly extending flange III,which may rest on any suitable supporting flange H, which is effectivealso to close the space between the pot and the drum i so that aircannot pass from the space between the pot 6 and the drum i except bypassing through the apertures inthe pot itself. I illustrate two rows ofair inlet apertures, a lower row I 2 and an upper row ll. Preferably theapertures of the upper row I are upwardly and inwardly tilted in orderto project air jets upwardly and inwardly into the space within the pot6. I5 is any suitable baflle or pilot ring, which may rest for exampleoninwardly extending supports or pins l6. Preferably I provide aclearance, as at H, between the periphery levels.

of the ring l5 and the opposite wall of thepot. 20 is any suitable firering adapted to close the top of the pot except for the axial outlet oropening 2|. 22 is any suitable wall for the combustion chamber proper.It will be understood that any suitable flue means may be employed formaintaining proper draft conditions and for carrying oil the products ofcombustion from'the combustion chamber 22. It will be understood alsothat, if the invention is applied to a hot water heater, it may bedesirable to employ a central wall or flue, indicated in dotted line asat 23, which may be positioned between the flanges 24 and 25 upwardlyextending from the" fire ring 20. In that event any suitable packing 28may be employed.

In proportioning the holes [2 and I4, it is found desirableto have asubstantially larger number of holes at the upper level.' The holes areso proportioned in Fig. 1 as to provide forty holes at the lower levelandone hundred holes at the upper level, the lower level holes being ofslightly greater diameter.

It will be realized that, whereas a practical and operative device isdescribed and illustrated, nevertheless many changes may be made in thesize, shape, number and disposition of parts, without departing from thespirit of the invention. It is therefore wished that the description anddrawing be taken as in a broad sense illustrative or diagrammatic,rather than as a limitation to theprecise showing. The use and operationof the invention are as follows:

It has been customary in the past in pot type burners to employ aplurality of air inlet apertures in the wall of the pot, located at aplurality of different levels. In order to simplify the structure and toimprove its operation, I find it desirable to concentrate the aperturesat two Stated otherwise, this involves delivering air to the pot at onlytwo levels, one above the pilot ring and the other below.

.It will' be understood that, when the burner is operated at the loweror pilot stage, the apertures I! provide enough air for the combustionof all of theliquid fuel supplied along the inlet 8, this combustiontaking place at or slightly flame level rises until it is above theapertures it, or, in practice, at the aperture 2i of the flame ring 20.

What is claimed is:

1. In a pot type burner for liquid fuel, a pot having a bottom and agenerally cylindrical side wall, a centrally apertured flame ringpartially closing the open top of the pot,- said side wall having asingle row of secondary air inlet aper- 'tures spaced slightly belowsaid flame ring, and having a single row of primary air inlet apertures2. In a pot type burner for liquid iuels, a pot having a bottom and agenerally cylindrical side wall, a centrally apertured flame ringpartially closing the open top of the pot, said side wall hav ing a,single row of secondary air inlet apertures spaced slightly below saidflame ring, and having a plurality of primary air inlet apertureslocated substantially in the lower half of the pot Wall, a singlecentrally apertured pilot baflle positioned above all the primary airinlet apertures and below the row of secondary air inlet apertures, andsubstantially closer to the primary than to the secondary air inletapertures, the total cross sectional area of the secondary air inletapertures exceeding the total cross sectional area of the primary airinlet apertures, and means for delivering liquid fuel to the spacebetween the pilot haflle and the pot bottom.

BRUCE HAY'IER.

